The DAA says passengers checking in a bag should allow an extra hour.
Dublin Airport has revised its advice to passengers queuing for flights.
It now says intending passengers should arrive 2 hours in advance for a short-haul flight, and 3 hours for a long-haul flight.
Passengers checking in a bag should allow additional time of up to an hour.
Previously the advice was 2 and a half hours, and 3 and a half hours respectively.
The DAA says there have been no significant security challenges in June, July or August, adding "no passengers have missed flights in these three months that heeded our advice."

Gardaí Investigate Discovery Of Man's Body At Dublin Recycling Facility
Charges Dropped Against Asylum Seeker Accused Of Sexual Assault In Saggart Last year
Gardaí Launch Investigation After Body Found In Cork
Ireland Prepares For Winter As Clocks To Go Back This Weekend
Introduction Of Plug-In Solar Panel Technology Approved
Normal People Actors Among Signatures On Letter To UK Government Supporting Sally Rooney
Kildare Saw Significant Increases In Road Deaths This Year
According To New Figures Over 70,000 People Leave ED's Before Finishing Treatment